Apologies if this is the wrong location for this, but here goes...

Our company officially has a policy of flying business for trans-oceanic flights, however we've been on a cost cutting binge so I've been flying coach and trying to upgrade with miles. Do any of your employers permit reimbursement for such mileage related upgrades and at what rates? Obviously its a good deal for the company in my case vs. a business ticket...

thanks!